Brush.



PATENTED AUG. 11,1903;

M. MoGARTHY.

BRUSH.

APPLICATION I'ILEI) MAY-31, 1902.

1T0 MODEL.

[NVENZ'OR THE nonms PETERS m4 womumn WASHKNGYON, n. c.

UNITED STATES Patented August 11, 1903.

PATENT OFFIGE."

BRUSH.

.SPECIFIGATION forming part of Letters PatentNo. 735,797, dated August11, 1903.

Application filed May 31,1902.

To aZZ whont it may concern-.-

Be it known that 1, MICHAEL M CARTHY, a citizen of the United States,residing at Brockton, in the State of Massachusetts, have inventedcertain new and useful Improvements in Brushes Which are Adapted to beRotated, and Especially to Those That Bequire Considerable Strength inTheir Construction; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to improvements in brushes; and the objects of myinvention are, first, to provide a brush in which the bristles or otherparts of a like character shall be very firmly held; second, toconstruct the parts'so that they shall be strong enough to withstand thecentrifugal force resulting from a .high speed of rotation; third, toproduce a brushi which can be cheaply made andthe which can be easilyput together.

I obtain the objects'of' my invention by the mechanism illustrated inthe accompanying drawings, in which- I Figure 1 shows an'end view of abrush with the bristles held in the outer rim of the brush and thecentral core in its place. Fig. 2 represents the outer rim before thebristles are inserted and with the core removed. This fig ore is a viewfrom one side and shows the holes on the outside of the rim in which thebristles are to be inserted and the holes on the inside of the rimthrough which the cord for holding the bristles passes;- Fig. 3 is asection of a part of the outer rim of a brush, showing some of thebristles in place and the cord. This figure shows a large number ofholes for the insertion of bristles. Each hole has a small opening tothe inside of the rim.

Similar letters refer to similar parts throughout the several views.

In orderto construct the brush-of my invention,I take a cylinder of woodof the size of the core A which I desire and preferably roll paper Baround it. After the cylinder has been covered with one thickness ofpaper I begin to glue the paper and continue the process of rollinguntil the core has been made the desired size. This thickness will vary,according to the kind of a brush departs of SerialNo'. 109,669. (Nomodel.)

sired, but thc thickness will usually be from one-half to three-quartersof an inch. I prefer to use a roll of a length, generally of fortyinches,sufficientto make anumber of brushes; but this is only a; matterof convenience and economy. With a saw I out this roll and inclosing rimof paper into parts according to the width or thickness of the brushwhich I desire to make. I bore into the periphery of the rim holes, asshown in Fig. 2, adapted to the kind of a brush desired; but these holesare usually about one-eighth of an inch in diameter. These holes goentirely through the rim, but they are smaller at the interior of therim than at the outside. In the boring of these holes I use a bit whicheither has a shoulder or else it draws to a smaller diameter at itspoint. Both of these forms of holes are shown in Fig. 3 of the drawings.In some kinds of brushes one kind is preferable to the other; but eithermay be used. The core of the rim is knocked out in order to allow of theoperation of inserting the bristles. These bristles are drawn from theoutside by means of a'cord,wire, or other flexible means, (see f, Fig.3,) the cord or'wire being sent from the inside of the rim to theoutside and looped over the center of the bristles.' The bristles arethen drawn into the holes as far as the shoulder or the beginning of thenarrowing of the holes, as shown in Fig. 3. This process of insertingthe bristles is continued until all the holes are filled, care beingtaken to draw the cord or wire tightly at every hole. When all thebristles have been inserted, the ends of the cord or wire are fastenedusually with a small tack d, driven into the inside of the rim. UsuallyI replace within the rim the core A, which has been driven out, or someequivalent therefor; The core-when replaced is usuallycoated with glueon its periphery, and the brush becomesquiteri'gid in itscons'trutstiOnfThiough the center of the core I bore a hole h of thesize required to fit the shaft on which the brush will be mounted forthe purpose of being made to revolve. When mounted upon a revolvingshaft, there is no danger that. the parts will fly into pieces, for therim, made by the winding of paper or similar material, is very strongand will stand a great strain.

After havingtried a great many ways of producing a round revolving brushI have adopted as my preferred construction one made by winding paper,as herein shown and described.

As the brushes which I make must be revolved at a very high rate ofspeed, it is important that they should be light in weight and that theouter rim should be of a material strong and tenacious enough to stand agreat centrifugal force and of an elastic nature. After repeatedexperiments with other materials for my outside rim I have secured therequisite strength, lightness, cheapness, elasticity, and other desiredqualities by winding a roll of paper around a cylinder, so as to form abristle-holder. It is necessary to fasten the bristles or other brushingmaterial very securely to the holder, so as to prevent them from beingdriven out.

I do not wish to be limited to the use of bristles for my brush.

I know that brushes have been made having one part holding the bristlesand another part covering the back of the holder and do not claim,broadly, a brush of this description. Y

What I claim, and desire to secure by Letters Patent, is-

1. A circular brush composed of a wooden core, having means forattaching it to. a revolving shaft; a holder made by winding a sheet ofpaper around the core and provided with holes from the exterior to theinside face and being attachable to and detachable from the core andbrushing materials drawn into the holes of the holder and fastenedthereto by a continuous cord substantially as shown or described.

2. In a circular brush the combination of a holder made by winding paperaround acore and provided with holes therethrough, said holes beingsmaller at the inside face than at the outside; a wooden core within theholder made attachable to and detachable from the holder; bristles inthe holes of the holder, and means for attaching the said core at itscenter to a revolving shaft substantially as shown or described.

MICHAEL MCCARTHY.

Witnesses:

MICHAEL CONNORS, CHAS. ALLEN TABER.

